Music Man HD-500 Bass (Edition 1) preset

Verified · 87/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The HD-500 is a 500-watt Music Man bass head with a solid-state power amp and a single valve gain stage in its preamp. Two inputs 10 dB apart feed that gain stage, then a footswitchable pair of EQ banks (bass, middle, mid/high, treble) gives two settings through one Master Volume. Music Man's LVR speaker-response control, a limiter, a pre/post-EQ XLR direct out, an effects loop and a tuner out with mute complete it.

• Made in: USA
• Wattage: 500W
• Channels: 1

Tags: american, hybrid, bass, high-wattage.

Schematic-derived preset files for 16 Fractal and Line 6 modelers: Axe-Fx II/XL/XL+, Axe-Fx III, FM3, FM9, and the full Helix family (Floor, LT, Rack, HX Stomp, HX Stomp XL, Native).

Gridleak extracts amp parameters from original circuit schematics using AI vision — component values, gain staging, tone stack topology, tube types — then generates native preset files for every supported modeler. Every extraction is scored 0–100 and the score is published.